ENH: make OSstream indentation adjustable

- this is principally for cases where reduced indentation is desired,
  such as when streaming to a memory location. If the indentation size
  is zero or one, only a single space will be used to separate the
  key/value.

  This change does not affect the stream allocation size, since the
  extra data falls within the padding.

ENH: relocate label/scalar sizes from Istream to IOstream.

- could allow future use for output streams as well?

  Due to padding, reorganization has no effect on allocated size
  of output streams.

STYLE: add read/write name qualifier to beginRaw, endRaw

- removes ambiguity for bi-directional streams

STYLE: fix inconsistent 'const' qualifier on std::streamsize

- base Ostream was without const, some derived streams with const

applications/test/OListStream/Test-OListStream.C

@@ -73,6 +73,17 @@ void printTokens(Istream& is)
 }
 
 
+// Generate some dictionary-like content
+template<class OS>
+void outputDict(OS& os)
+{
+    os.beginBlock("testDict");
+    os.writeEntry("bool",   "false");
+    os.writeEntry("scalar", 3.14159);
+    os.endBlock();
+}
+
+
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 // Main program:
 
@@ -188,6 +199,28 @@ int main(int argc, char *argv[])
         << "content size=" << written.size()
         << " capacity=" << written.capacity() << nl;
 
+
+    Info<< nl << "Test dictionary" << nl;
+    {
+        OListStream os1;
+
+        outputDict(os1);
+
+        Info<< "Regular" << nl;
+        printInfo(os1);
+    }
+
+    {
+        OListStream os2;
+        os2.indentSize() = 0;
+
+        outputDict(os2);
+
+        Info<< "Compact" << nl;
+        printInfo(os2);
+    }
+
+
     Info<< "\nEnd\n" << endl;
 
     return 0;

applications/test/sizeof/Test-sizeof.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2009-2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
                             | Copyright (C) 2011 OpenFOAM Foundation
@@ -62,6 +62,19 @@ using namespace Foam;
 int main(int argc, char *argv[])
 {
     cout<<"sizeof\n------\n";
+
+    if (true)
+    {
+        cout<<"IOstream:" << sizeof(IOstream) << nl;
+        cout<<"Istream:" << sizeof(Istream) << nl;
+        cout<<"IPstream:" << sizeof(IPstream) << nl;
+        cout<<"ISstream:" << sizeof(ISstream) << nl;
+
+        cout<<"Ostream:" << sizeof(Ostream) << nl;
+        cout<<"OPstream:" << sizeof(OPstream) << nl;
+        cout<<"OSstream:" << sizeof(OSstream) << nl;
+    }
+
     {
         nil x;
         cout<<"nil:" << sizeof(x) << nl;